In clan management under the family/heirs tab near the bottom of the page you'll see a few round icons. These will be grey'd out until you unlock them by gaining enough respect. You can appoint each general one of these positions, they have bonuses such as increased tax revenue, reduced recruitment cost and other stuff.
Only NON-heir's and non-Diaymos can be placed in these positions; aka. just regular generals. --- "If we can hit that bulls-eye, the rest of the dominoes will fall like a house of cards. Checkmate"
Assigning the right commissions to the right generals can truly be a great help, especially if you have some high-level generals (more stars = more effective in office). I love comptroller in particular because of the clan-wide upkeep cost bonus.